/Engine/Source/Editor/LandscapeEditor/Public/LandscapeFileFormatInterface.h
Validate a file for Import Gives the file format the opportunity to reject a file or return warnings as well as return information about the file for the import UI (e.g. resolution and scale)
information about the file and (optional) error message
[FLandscapeFileInfo](API\Editor\LandscapeEditor\FLandscapeFileInfo) Validate ( const TCHAR * Filename, [FName](API\Runtime\Core\UObject\FName) LayerName ) const